Finding the Fourth Proportional to 1,016.28, 1,524.42 and 399.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,016.28 : 1,524.42 = 399.96 : x
2. Step 2: Convert to fraction form
   1,016.28/1,524.42 = 399.96/x
3. Step 3: Cross multiply
   1,016.28x = 1,524.42 × 399.96
4. Step 4: Simplify right side
   1,016.28x = 609,707.02
5. Step 5: Solve for x
   x = 609,707.02/1,016.28
6. Step 6: Final answer
   x = 599.94